token bus

(IEEE 802.4) A networking protocol which mediates
access to a bus topology network as though it were a token
ring. This eliminates the collisions found in carrier
sense collision detect protocols. Nodes can be configured
to pass the token in any order, not necessarily related to
their physical ordering on the bus. The token is sent from
one node to its successor in the logical ring by broadcast on
the bus and is ignored by the other nodes.